Download 18.3 Notes

Name ___________________________
Chapter 18
Class ___________________
Date _____________
The Electromagnetic Spectrum and Light
Section 18.3 Behavior of Light
(pages 546-549)
This section discusses the behavior of light when it strikes different
types of materials.
Reading Strategy (page 546)
Monitoring Your Understanding As you read, complete the flowchart
to show how different materials affect light. For more information on
this Reading Strategy, see the Reading and Study Skills in the Skills
and Reference Handbook at the end of your textbook.
Light and Materials
Materials can be
Transparent
Translucent
Opaque
and an example of each is
© Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved.
Glass or water
Frosted glass
Wood
Light and Materials (pages 546–547)
1. Is the following sentence true or false? Without light, nothing
true
is visible.
Match each term to its definition.
Term
b
a
c
2. transparent
3. opaque
4. translucent
Definition
a. Material that absorbs or
reflects all of the light that
strikes it
b. Material that transmits light
c. Material that scatters light
Interactions of Light (pages 547–549)
5. Is the following sentence true or false? Just as light can affect matter,
true
matter can affect light.
reflected
6. When light strikes a new medium, it can be
,
absorbed
transmitted
, or
.
Physical Science Guided Reading and Study Workbook
■
Chapter 18 161
Name ___________________________
Chapter 18
Class ___________________
Date _____________
The Electromagnetic Spectrum and Light
7. When light is transmitted, it can be refracted, polarized, or
scattered
.
8. A copy of an object formed by reflected or refracted light waves is
image
known as a(n)
.
9. When parallel light waves strike an uneven surface and reflect off
regular
it in the same direction,
reflection occurs.
10. When parallel light waves strike a rough, uneven surface and
diffuse
reflect in many different directions,
reflection occurs.
refracts
11. Light bends, or
, when it passes at an angle
from one type of medium into another.
12. Explain why a mirage occurs. Light travels faster in hot air than in cooler, denser air. On a hot
day, light is gradually refracted as it moves into layers of hotter and hotter air. This refraction causes
some of the light to follow a curved path to the ground.
13. Is the following sentence true or false? Light with waves that
true
vibrate in only one plane is polarized light.
Vertical polarizing
filter
Horizontal polarizing
filter
Polarizing Filters
Direction of Light Vibration
Filter Type
Action
Horizontal wave
Vertically polarizing filter
Light is blocked.
Vertical wave
Vertically polarizing filter
Light passes through.
15. How do sunglasses block glare? The vertically polarized filters of the sunglasses block the
horizontally polarized light being reflected.
16. The effect when light is redirected as it passes through a medium
scattering
is called
.
17. Explain why the sun looks red at sunset and sunrise. Small particles in the
atmosphere scatter shorter-wavelength blue light more than light of longer wavelengths.
Longer wavelengths of orange and red light reach the eyes.
162
Physical Science Guided Reading and Study Workbook
■
Chapter 18
© Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved.
14. Refer to the drawing and complete the table on polarizing filters.